fix(stage-web): include sitemap from docs as base sitemap

Author: nekomeowww

apps/stage-web/netlify.toml

@@ -1,6 +1,6 @@
 [build]
 base = "/"
-command = "pnpm -F @proj-airi/stage-web run build && pnpm -F @proj-airi/docs run build:base && mv ./docs/.vitepress/dist ./apps/stage-web/dist/docs && pnpm -F @proj-airi/stage-ui run story:build && mv ./packages/stage-ui/.histoire/dist ./apps/stage-web/dist/ui"
+command = "pnpm -F @proj-airi/stage-web run build && pnpm -F @proj-airi/docs run build:base && mv ./docs/.vitepress/dist ./apps/stage-web/dist/docs && cp ./apps/stage-web/dist/docs/sitemap.xml ./apps/stage-web/dist/sitemap.xml  && pnpm -F @proj-airi/stage-ui run story:build && mv ./packages/stage-ui/.histoire/dist ./apps/stage-web/dist/ui"
 publish = "/apps/stage-web/dist"
 
 [build.environment]